A critical overview of transboundary aquifers shared by South Africa

Cobbing, Jude; Hobbs, P. J.; Meyer, Rex; Davies, J.

doi:10.1007/s10040-008-0285-2

Cited by 23 publications

(14 citation statements)

References 3 publications

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“…1). In addition, at least seven aquifers extend across South Africa's national boundaries and into the same six neighbouring states (Struckmeier et al 2006;Cobbing et al 2008) (Fig. 1).…”

Section: Transboundary River Basins and Aquifersmentioning

confidence: 97%

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An overview of the content and historical context of the international freshwater agreements that South Africa has entered into with neighbouring countries

Kistin

Ashton²,

Earle

et al. 2008

Int Environ Agreements

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“…1). In addition, at least seven aquifers extend across South Africa's national boundaries and into the same six neighbouring states (Struckmeier et al 2006;Cobbing et al 2008) (Fig. 1).…”

Section: Transboundary River Basins and Aquifersmentioning

confidence: 97%

“…Many of the aquifers in the region also extend across national boundaries and are shared by multiple countries . South Africa shares six river basins (Ashton et al 2008b) and at least seven aquifer systems with six neighbouring states (Struckmeier et al 2006;Cobbing et al 2008).…”

Section: Introductionmentioning

confidence: 99%

An overview of the content and historical context of the international freshwater agreements that South Africa has entered into with neighbouring countries

Kistin

Ashton²,

Earle

et al. 2008

Int Environ Agreements

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“…The latter, which are often of tensional origin, may play an important part in groundwater circulation [24]. Structural features associated with faulting are important targets for groundwater exploration, as it occurs along vertical and horizontal (bedding planes) structures in these rocks [25].…”

Section: Regional Geology and Hydrogeology Ease Of Usementioning

confidence: 99%

Geophysical and Hydrogeological Groundwater Prospectivity Mapping in the Kraaipan Granite-Greenstone Terrain, Southeast Botswana

Ranganai¹,

Moidaki²,

King³

et al. 2017

JWARP

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Application of regional geophysical methods for hydrogeological purposes has increased over the last two decades especially in arid and semi-arid areas. A project to map the Kraaipan granite-greenstone terrain in southeast Botswana has recently been undertaken using regional aeromagnetic and gravity data with the aim to map the rocks at depth to understand the geology while the secondary objective was to subsequently assess the mineralization and groundwater potential in the area. An integrated analysis of the aeromagnetic and gravity data and their derived/processed products is hereby investigated for groundwater for drinking and agricultural purposes. The studies include: subsurface characterisation and delineation of structural framework suitable for groundwater exploration and determination of petrophysical relationships used to link the geophysical properties (e.g., density) to hydrological properties (e.g., porosity). The results of interpretation indicate that the rocks are under ~50 m of Kalahari cover and the study area is composed of three aquifers: the extensive hard rock aquifer (granitic and volcanic), the important (fractured) karst aquifer and the minor sedimentary aquifer. The area is dissected by an ENE-to-EW-trending dyke swarm visible on the regional aeromagnetic data and much clearer on high resolution aeromagnetic data. Minor fault and/or dyke elements of NW-SE and NE-SW trend are observed. Spectral analysis reveals three main average ensample interfaces at depths of 0.7 km, 1.99 km and 4.8 km. The linear Euler solutions maps reveal that the majority depths to top of magnetic bodies range from 40 m to 400 m throughout the survey area. The shallowest depths are the most significant one in this case as they probably relate to depth of bedrock and thickness of regolith or thickest sediments. For 2695 existing boreholes analysed, maximum borehole depth is 482 m (mean 108 m), and almost half (1263) /hr) and an average water strike of 64 m. There is very little correlation between interpreted hydrogeological features and the existing borehole locations. The study shows the importance of preliminary geophysical investigations before ground borehole siting and drilling in order to improve borehole success rates and/or reduce costs inherent in groundwater projects.

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“…Cobbing et al (2008) reported that most so-called TBAs that border South Africa are low-yielding aquifers with only small water demand from a low population density so that the risk of over-pumping or pollution is generally low. They concluded that potential dispute over transboundary groundwater is not a major concern but rather an opportunity to improve technical cooperation and data sharing between neighbour states, and for collaborative training and research.…”

Section: Tbas In Sub-saharan Africamentioning

confidence: 99%

“…However, Cobbing et al (2008) argue that where transmissivities are low, the potential for groundwater movement is also low, and the technical resolution of the allocation of the resource may be difficult. Besides, uncertainty regarding water demand trends, impact of over-exploitation on riverine ecology, and the impact of groundwater resource development in tributary catchments on downstream shared aquifer resources collectively conspire to complicate the issue.…”

Section: Tbas In Sub-saharan Africamentioning

confidence: 99%

Identifying transboundary aquifers in need of international resource management in the Southern African Development Community region

Davies

Robins

Farr³

et al. 2012

Hydrogeol J

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Transboundary Aquifer (TBA) management in part seeks to mitigate degradation of groundwater resources caused either by an imbalance of abstraction between countries or by cross border pollution. Fourteen potential TBAs were identified within a hydrogeological mapping programme based on simple hydrogeological selection criteria for the Southern African Development Community region. These have been reassessed against a set of five data categories, of which (1) groundwater flow and vulnerability is perceived as the overarching influence on the activity level of each TBA, while other contributing categories are (2) knowledge and understanding, (3) governance capability, (4) social/demand and (5) environmental issues. These assessments enable the TBAs to be classified according to their need for cross-border co-operation and management. The study shows that only two of the fourteen TBAs have potential to be the cause of tension between neighbouring states, while nine are potentially troublesome and three are unlikely to become problematic even in the future. The classification highlights the need to focus on data gathering to enable improved understanding of the TBAs that are potentially troublesome in the future due, for example, to change in demographics and climate.

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A critical overview of transboundary aquifers shared by South Africa

Cited by 23 publications

References 3 publications

An overview of the content and historical context of the international freshwater agreements that South Africa has entered into with neighbouring countries

An overview of the content and historical context of the international freshwater agreements that South Africa has entered into with neighbouring countries

Geophysical and Hydrogeological Groundwater Prospectivity Mapping in the Kraaipan Granite-Greenstone Terrain, Southeast Botswana

Identifying transboundary aquifers in need of international resource management in the Southern African Development Community region

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